Start a daemon using the config file and the start_mode.
--- start_mode : hypnotoad hypnotoad : pid : /tmp/restmd.pid [...] env : foo : bar
The above configuration will will cause "myapp start" to be equivalent to
foo=bar myapp hypnotoad --pid /tmp/restmd.pid [..]
In other words, keys and values in the configuration file become options preceded by double dashes.
If a key has a single dash, it is sent as is (with no double dash).
The special value "null" means don't send an argument to the command line option.
The special label "env" is an optional hash of environment variables to set before starting the command.